Hypodermic syringe.



N0. 762,603. PATENTED JUNE 14, 1904.

G. WITKOWSKI. HYPODERMIG SYRINGE.

APPLIUATION FILED DBO. 26, 1903.

N0 MODEL.

UNITED STATES Patented June 14,. 1904.

PATENT OFFICE.

CHARLES WITKOWSKI, OF BOSTON, MASSACHUSETTS, ASSIGNOR TOTHE RANDALL-FAIOHNEY 00., OF BOSTON, MASSACHUSETTS, A CORPORA- TION OF MASSACHUSETTS.

HYPODERMIC SYRINGE.

SPECIFICATION forming part of Letters Patent No. 762,603, dated June 14, 1904. Application filed December 26, 1903. Serial No. 186,558- (No model.)

Owing to the many advantages possessed by glass syringes, they are widely used by physicians and dentists for hypodermic injections, and while various means have been devised for connecting the needle with the glass body of the syringe the most certain and generallyused structure is that wherein the end of the body is drawn out to form a tip externally screw-threaded to engage an internal thread on the needle-base. This construction, however, is open to serious objection, because the delicate glass tip readily breaks and comes away with the needle. In dental work, especially when making an injection in the mouth,

if the patient suddenly starts'the strain is apt to break the tip, leaving the needle sticking 0 into the gum, or it will drop into the mouth, causing great annoyance to both the dentist and the patient, and sometimes such an accident is fraught with danger, owing to the powerful acids or fluids with which the syringe is charged.

My present invention has for its object the production of means whereby such accidents are prevented and the use of a glass syringe rendered as safe as one made of metal, hard 40 rubber, or other more durable material than glass.

The novel features of my invention will be fully described in the subjoined specification, and particularly pointed out in the following claims.

Figure 1 is aside elevation of a glass syringe with one embodiment of my invention applied thereto. Fig. 2 is a longitudinal sectional view thereof on the line 2 2, Fig. 1. Fig. 3 shows in side elevation and separated the metal guard for the syringe-body, its retaining-cap,

. and the safety-coupling which retains the neeternal thread 0 of the retaining-cap 0 the latter having an internal annular flange 0*, (see Fig. 2,) which bears against the open end of the body a. The opposite end of the guard is incurved at 0" to fit around the adjacent end of the body and is centrally apertured at c for the passage therethrough of the tip (1 all as clearly shown in Fig. 2. By tightening the cap 0 the guard is drawn up to snugly hold the body in position, so that it cannot turn or move endwise in the guard.

The needle (Z, (shown separately in Fig. 4,) having a base (Z, interiorly threaded at (Z to screw onto the glass tip a, is substantially of usual construction with the exception that in accordance with the present embodiment of my invention the end of the base is provided with an annular flange (Z of greater diameter than any other part of the base.

I have provided a coupling to connect the needle and the guard c wholly independently of the tip a, so that if the latter breaks the needle and tip cannot separate from the main portion of the syringe. To this end an annular coupling f, preferably made of thin metal, is internally threaded at f at its inner end to engage an externally-threaded portion e on the guard 0. The outer end of the coupling f is inturned to present an annular flange f which will engage the flange cZ' on the needlebase, as clearly shown in Fig. 2, the opening f bounded by the flange f", permitting the passage of the needle and its base, but being smaller than the diameter of the base-flange d".

In using the apparatus the needle-base is first screwed onto the tip a and then the coupling f is slipped over the needle and its base, and it is screwed onto the threaded end of the guard until the flanges f and (Z firmly engage. The instrument is then ready for use, and it will be manifest that even if the tip a be fractured or broken off from the body the needle cannot separate, as the coupling connects it securely With the main portion of the syringe, so that it can be instantly withdrawn when the breakage is discovered. The needle is thus attached to the syringe by two entirely independent connectionsthe main or operating connection, by or through the threaded tip, and the auxiliary connection, as it may be termed, or coupling.

In order to detach the needle, the coupling must first be loosened, and then the needle can be unscrewed from the tip. I

The construction is simple, it adds very little to the cost of the apparatus, and renders it absolutely safe when in use.

Myinvention is not restricted to the precise construction and arrangement shown and described, as the same may be varied or modified in difl'erent particulars by those skilled in the art Without departing from the spiritand scope of my invention.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A syringe having a glass body, and tip, a needle detaehably connected with the tip, and independent means to prevent separation of the needle and body upon breakage of the tip.

2. A syringe having a glass body, a detachable needle to cooperate therewith, a separable main connection between the needle and the body, and an independent auxiliary connection between the needle and said body to preventseparation of the needle from the body upon failure of the main connection.

3. A syringe having a glass body anda tubular, externally-threaded tip, a needle having a base internally threaded to screw upon said tip, and independent means to connect said needle with the body and prevent separation thereof upon breakage of the tip.

4. A syringe having aglass body and tip, a

.needle detachably connected with the tip, a

protective casing or guard for the body, and a coupling to cooperate with the said guard and needle and prevent separation of the latter upon breakage of the tip.

5. A syringe comprising a glass body having a tubular, externally-threaded tip, a metallic guard for said body, having an end opening for the passage of the tip, and externally threaded adjacent said opening, a needle having an internally-threaded base to screw upon the tip, an annular flange on the needle-base, and a coupling adapted to engage said flange and to screw upon the threaded end of the guard, to form an independent connection between the needle and the main portion of the syringe.

6. A syringe comprising a glass body having a tubular, externally-threaded tip, a needle adapted to be screwed thereon and having an annular base-flange, a coupling to engage said flange and embrace the adjacent end of the syringe-body, and means to ad j ustabl y connect said coupling and body.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses. 7

CHARLES WVITKOVVSKI.

Witnesses:

JOHN C. EDWARDS, EMILY C. HoDGEs. 

